Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 202054
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
254 PM CST MON FEB 20 2017

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN.

WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH
IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVE, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10% OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...HIGH PRESSURE OF 30.3 INCHES OVER WESTERN QUEBEC TILL
MOVE EAST TONIGHT WHILE LOW PRESSURE OF 29.4 INCHES OVER MANITOBA
WILL MOVE TO HUDSON BAY TONIGHT AND DEEPEN TO 29.2 INCHES AS IT
DOES. AN ASSOCIATED COLD FRONT WILL PASS OVER THE LAKE EARLY
TUESDAY MORNING. A WEAK HIGH PRESSURE RIDGE AVERAGING 29.9 INCHES
WILL THEN BUILD OVER THE SOUTHERN MISSISSIPPI VALLEY TUESDAY
AFTERNOON. A LOW OF 29.6 INCHES THEN MOVES OVER THE NORTHERN
PLAINS WEDNESDAY AND DEEPENS TO AROUND 29.4 INCHES AS IT PASSES
OVER THE WESTERN GREAT LAKES WEDNESDAY EVENING. A STRONG LOW
PRESSURE OF AROUND 29.2 INCHES IS THEN FORECAST TO MOVE NORTHEAST
INTO THE LOWER GREAT LAKES FRIDAY NIGHT INTO EARLY SATURDAY.

LMZ261-362-364-366-563-565-567-868-210430-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
254 PM CST MON FEB 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...SOUTHEAST WINDS 20 TO 25 KT INCREASING TO 30 KT EARLY
THIS EVENING AND THEN VEERING SOUTHWEST INTO OVERNIGHT.
OCCASIONAL GALE FORCE GUSTS THIS EVENING. CHANCE OF RAIN SHOWERS
THIS EVENING...THEN RAIN SHOWERS LIKELY WITH SLIGHT CHANCE OF
THUNDERSTORMS OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT
BUILDING TO 6 TO 9 FT OCCASIONALLY TO 11 FT.
.TUESDAY...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO
15 KT BY EARLY AFTERNOON. CHANCE OF RAIN SHOWERS IN THE MORNING.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT BY THE AFTERNOON.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST 15 TO
25 KT LATE IN THE EVENING. WAVES 2 TO 4 FT BUILDING TO 3 TO 6 FT
OCCASIONALLY TO 8 FT.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KT BECOMING NORTHWEST.
CHANCE OF FREEZING RAIN OVERNIGHT. WAVES 2 TO 4 FT.
.THURSDAY...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH. WAVES
2 TO 4 FT.
.THURSDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT INCREASING TO
30 KT. CHANCE OF RAIN AND SNOW SHOWERS. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY...EAST GALES TO 35 KT BECOMING NORTHEAST. RAIN AND SNOW
SHOWERS. WAVES BUILDING TO 7 TO 10 FT OCCASIONALLY TO 13 FT.
.SATURDAY...NORTH GALES TO 40 KT BECOMING NORTHWEST GALES TO
35 KT. SNOW SHOWERS LIKELY. WAVES 6 TO 9 FT OCCASIONALLY TO 11
FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-210430-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
254 PM CST MON FEB 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...SOUTHEAST WINDS 15 TO 25 KT INCREASING TO 30 KT EARLY
THIS EVENING...AND THEN VEERING SOUTHWEST INTO OVERNIGHT. SLIGHT
CHANCE OF RAIN SHOWERS LATE THIS EVENING...THEN RAIN SHOWERS
LIKELY WITH SLIGHT CHANCE OF THUNDERSTORMS OVERNIGHT. WAVES 4 TO
7 FT OCCASIONALLY TO 9 FT.
.TUESDAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST 10 TO 15 KT
EARLY IN THE AFTERNOON. CHANCE OF RAIN SHOWERS IN THE MORNING.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST.
WAVES 1 TO 3 FT.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. WAVES
2 TO 4 FT.
.WEDNESDAY NIGHT...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST.
WAVES 2 TO 4 FT.
.THURSDAY...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH. CHANCE OF
RAIN SHOWERS IN THE AFTERNOON. WAVES 2 TO 4 FT.
.THURSDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT BECOMING EAST TO 30
KT. RAIN SHOWERS. WAVES BUILDING TO 6 TO 9 FT OCCASIONALLY TO 11
FT.
.FRIDAY...EAST WINDS TO 30 KT BECOMING SOUTHEAST. RAIN SHOWERS
WITH A CHANCE OF THUNDERSTORMS. WAVES 7 TO 10 FT OCCASIONALLY TO
13 FT.
.SATURDAY...NORTHWEST GALES TO 35 KT. CHANCE OF RAIN AND SNOW
SHOWERS. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT.

$$

LMZ761-210430-
MAFOR 2022/
MICHIGAN NORTH 11330 11340 19350 11440 19350 11446 11546 11530
11520 11510. CHANCE OF RAIN SHOWERS THIS EVENING. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT BUILDING TO 6 TO 9 FT OCCASIONALLY TO 11 FT
TONIGHT. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT TUESDAY MORNING
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT BY TUESDAY AFTERNOON.

MICHIGAN SOUTH 11330 11340 11440 11446 11546 12520 11610. CHANCE
OF RAIN SHOWERS TUESDAY MORNING. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT TONIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT TUESDAY MORNING
SUBSIDING TO 2 TO 4 FT TUESDAY AFTERNOON.

$$

MTF

EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/LOT/GLFTABLE

GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES


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